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Bauschinger Effect and Back Stress in Gradient Cu-Ge Alloy

  • Topical Collection: Carl Koch Symposium: Mechanical Behavior of Nanomaterials
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Abstract

Using surface mechanical attrition treatment (SMAT), a gradient structure composed of two gradient structure (GS) layers and a coarse grain (CG) layer was generated from a Cu-5.7 wt pct Ge alloy, significantly improving the yield strength of the sample. Unloading–reloading tests showed an unusual Bauschinger effect in these GS samples. The back stresses caused by the accumulated geometrically necessary dislocations (GNDs) on the GS/CG border increased with increasing strain. As found by electron backscatter diffraction (EBSD), the GNDs are mainly distributed in the gradient structured layer, and the density of the GNDs increase with increasing SMAT time. The effect of the back stress increased with increasing SMAT processing time due to the increase in the strain gradient. The pronounced Bauschinger effect in a GS sample can improve the resistance to forward plastic flow and finally contributes to the high strength of GS samples.

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Abbreviations

σ f :

Flow stress

σ o :

Friction stress

σ b :

Back stress

σ eff :

Effective stress

σ u :

Reverse yield stress

σ * :

Thermal part of the flow stress

γ :

Shear strain

σ r :

Yield stress during reloading

θ :

Local misorientations

μ :

Unite length

b :

Burgers vector

ρ GND :

Density of geometrically necessary dislocations

Er:

Reloading Young’s modulus

Eu:

Unloading Young’s modulus

ɛ rp :

Reverse plastic strain

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Acknowledgments

The authors would like to acknowledge the financial support by the National Natural Science Foundation of China (NSFC) under Grant No. 51561015 and No. 51664033. The authors also thank Dr. Xiao Long Ma for the calculation of GNDs. YTZ would like to acknowledge the support of the US Army Research Office under the Grant No. W911NF-09-1-0427. X.K. Zhu appreciates Professor Carl C. Koch for inviting him to visit his group more than once and for cooperative research on nanostructured materials for 15 years. This paper is dedicated to Carl Koch’s TMS symposium 2017 (Mechanical Behavior of Advanced Materials). This symposium will honor the outstanding contributions of Professor Carl C. Koch to many fields in materials science in the last 50 years and celebrate his 80th birthday.

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Authors and Affiliations

  1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650093, China

    Xianzhi Hu, Zhe Yin, Jian Yang, Yulan Gong & Xinkun Zhu

  2. School of Materials Science and Engineering, Nanjing University of Science and Technology, RM307 Building 340, Nanjing, Jiangsu, 210094, China

    Shenbao Jin, Yuntian Zhu & Gang Sha

  3. The Institute of Microstructures and Properties of Advanced Materials in Beijing University of Technology, Beijing, 100124, China

    Hao Zhou

  4. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695-7919, USA

    Yuntian Zhu

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  1. Xianzhi Hu
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Correspondence to Xinkun Zhu.

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Manuscript submitted January 1, 2017.

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Hu, X., Jin, S., Zhou, H. et al. Bauschinger Effect and Back Stress in Gradient Cu-Ge Alloy. Metall Mater Trans A 48, 3943–3950 (2017). https://doi.org/10.1007/s11661-017-4176-9

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